Pokatiokf o



Dec. 27, 1927..

H. A. WALLACE RAILWAY TRAFFIC CONTROLLING APPARATUS Filed April so, 1926 INVENTOR:

. (Q. MM,

Patented Dec. 27,

UNITElE STATES rarer rips HERBERT A. WALLACE, OF EDGE'WGOD BOROUGH, PENNSYLVANIA ASSIGNOB TO THE UNION SWITCH 6a SIGNAL COMPANY,

POBJATION O35, PENNSYLVANIA.

O]? SVVIS$VALR PENHSYLVANIAZr, A COB- RAILWAY-TRAFFIOCONTROLLING AEIEARATUfil.

Application filed April 30, 1926. Serial No. 105,763.

characters 1 and 1" designate the track rails of a stretch of railway track over which traiiic moves in both directions. These rails are divided, by means of insulated joints 2, into a plurality of successive track sections, A-B, B-C, etc. Each track section is provided with. a track relay designated by the reference character it with a distinguishing exponent and comprising two windings 7 and 8. Winding 7 of each track relay 1% is constantly connected across the righthand end of the associated section and winding s of each relay R is constantly supplied with alternating current from a suitable source such secondary 15 of an associated-line transformer designated by the reference character L with an appropriate distinguishing ezqoonent. The primary 16 of each line transformer L is constantly supplied with alternating current from alternator M, over line lIGS 8 and 3 Referring particularly to relay R the circuit for winding 8 of this relay may be traced from secondary 15 of transformer L through wires 17, 18 and l9, winding 8 of relay R and wires 20, 21, 22, 2-3 and 28, back to secondary 15 of transformer L lllach track section is normally supplied with alternating track circuit current from a tiach transformer designated by the refer- K with a suitable distin- '.lhe secondary it) of -h trail. oln'ier K is constantly connected acro therails adjacent the left-hand end of the ociatcd section in series with an nnpedantic 3. The supply of chi-wasting; Elit rent to the primary 11 of each transformer R will be described in detail hereinafter.

Each track section is further provided with a second transformer designated by the reference character G with a suitable enponent and having a secondary winding; 13

connected across the rails adjacent the righthand end of the associated section in series with an impedance 12 and back contact 39 is manifest therefore that secondary 13 rails of the corresponding section when and only when the track relay R for the same section is decnergized. Primary 14 of each transformer is at times supplied with aling current as will appear hereinafter,

ternat V Located ad acent the left-hand end of each track section is a control relay designated by .the reference character P with an exponent corresponding to the location. A. similar control relay designated by the reference character Q with an appropriate exponent is located adjacent the right-hand end of each. track section. The control relays P and Q for each tracl: section are controlled by the track relay R for such section. Refen ring, for example, to section il B the circuit for relay P may be traced from secondary 15 oftransfornier L through wires 17 and 24, back contact 25 of relay R wires 26, 26 and 27, winding of relay P wire 28, back contact 29 of relay P and wires '60. 31, 32, 33 and 23 back to secondary l5 of transformer L. The circuit for relay Q passes from secondary 15 of transformer L through wires 17 and24l, back contact 25 of relay R wires .26, 26 and winding of relay Q3, wire 35, back contact 36 of relay Q3, and wires 37, 38 23 and 23*, back to sec ondary 15 of ti sfornier L it will be seen that the circuit for each of the control relays I andQwincludes its own back contact and a baclr contact of the track relay for the associated section. l i hen the track relay is energized. therefore, both of the control relays are dengized. When the track relay is docume ted, however, the circuits will be closed for the control relays and the circuit for each control relay in uctee a baclr ccntact thereof; Tihe'. cunt relays will.

of the track relay R for the $211116 section.

of each transformer G is connected with the then both become energized. The opening of their back contacts will open their circuits and the control relays will then again open. It follows that as long as the track relay remains in its de-energized condition, the control relays will operate intermittently, opening and closing their back contacts.

Traffic through the stretch of track shown in the drawing is controlled by a plurality of governing devices here shown as track- Way signals each designated by the refer ence character S with a distinguishing exponent and each capable of indicating proceed, caution or stop. Signals S 8* and S located at pointsfi, B and A, respectively, governwesthound traiiic, that is, traffic moving from right to left, Signals S S and S govern eastbound tra lie, that is, tra'ihc moving from left to right. The signals S are controlled in accordance with any of the well known systems of single track signaling. The means for controlling these signals forms no part of my present invention and is omitted from the drawing for the sake of sins JliCitjyfl For purposes of explanation I will assume that the signals form apart of an absolute permissive block signal ing tem so that the signals all normally ind'cate proceed. When a section is occupied by strain moving in one direction the signals in advance of said train which govern traffic in the opposite direction indicate stop. l urtherinore, the signals which govern traffic in the direction in which the train is moving are so controlled that the signal associated with the occupied section indicates stop, and the signal associated with the section next in rear of the occupied section indicates caution. nal S is a circuit co -t-roller designated by the reference character D with an exponent corresponding to the location and arranged to close contact l5 when the signal. indicates proceed or caution, but to close contact l-6 when such signal indicates stop.

The primary 11 of transformer E is provided with one circuit which may be traced from secondary 15 of transformer L through wires it) and ll, contact l6 of circuit controller D, wire a8, primary 11 of transformer K and wires it 47, Sit-and 32 back to secondary 15 of transformer L". This circuit is closed only when signal S in dicates stop, under which condition uninterrupted alternating current is supplied to primary 11 of transformer K. When signal S indicates proceed or caution, the circuit just traced is opened and a second circuit is closed for primary 11 over which current flows from secondary 15 of transformer ii through wires and ll, contact 4-5 of circuit controller D wire 42, back contact 43 of relay P wire as, primary 11 of transformer K and wires -15, 47, 32 and 32 back to secondary 15 of transformer L When Associated with each sig this circuit is closed, and relay P is de-energizcd, uninterrupted alteri'iating current is supplied to primary 11. If, however, relay P is being operated to alternately open and close its back contact 4C3, the circuit just traced will be intermittently closed so that the alternating current supplied to primary 11 of transformer K" will he regularly interrupted.

The primary 11. of each of the ren'iaining transformers K is provided with circuits similar to those just described for trans- Primary 1% of transformer G is provided with a circuit which may be traced. from secondary 15 of transformer L through wires 17 and 24, hack contact 25 of relay R wires 26 and 56, contact 4: "5 of circuit controller D wire 51, each contact 52 of relay Q wire 53, primary 1% of transformer G and Wires 55, 21, 22, and 2L back to secondary 15 of transformer L li ith signal S indicating caution or proceed, lL relay R is de-energised, secondary 13 of transformer G is connected with the rails of section A-'B, relay Q will be intermittently operated as expiainec hereinbefore, and alternating cur rent will he supplied to primary is of transformer G" over the circuit just traced. But the operation of relay Q will alternately open and close this circuit so that the alternatinn current supplied to the rails of section lr-l3 is regularly interrupted.

il hen signal S is at stop however, the circuit just traced is interrupted and no current is supplied to the rails of section A-B by transformer G Each of the reniai ing transformers u is provided with circuits similar to those just described for transformer G As shown in the drawing the stretch of track is unoccupied so that signals S all in dicate proceed. Unintcrrupted alternating current is therefore supplied to the primary ll of each transforn'ier K. The track relay it for each section therefore energized so that the prin'iary 13 of each transformer G is disconnected from the rails of the associated section Since hack contact 25 of och track relay it is open, all of the control relays and are tie-energized, and the si-u'pply of our cut to primary 14 of each transforn'ier G is interrupte The traclrway apparatus herein shown and described is pan cuiaa'ly adapted for. though in no way limited to, use in connection with train carried governing moans arranged to ,g' 've one indication when interruptedalternatingcurrent flows in the track rails and to give a different indication when, the rails are supplied with uninterrupted tiltifii'l'liziilili current or with no current. Train carried govmeans of this type usually controlled by the currents in the tracltway through the medium of receiving apparatus lid fill

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carried on the train in advance of the forward axle. It follows that with apparatus of this type the source of train controlling current must always be connected with the rails ahead of the train.

In explaining the operation of the apparatus, I will first assume that westbound train enters section A.B. The presence of this train. in. this section causes signals il and S to indicate stop. but signal S indicates proceed. The presence of the train in section A-B also causes relay E to be open, thereby connecting the secondary 13 of transformer G with the rails of the scction through contact 39. The closing of back contact 25 of relay B also causes control relays P and Q to be intermittently cperated. Contact of circuit controller I) is closed so that alternating currentis supplied to primary 11 of transformer K over back contact 43 of control relay P Section A--B is therefore supplied with interrupted alternating current in advance of the train.

It should be noted that under these conditions interrupted alternating current being supplied to primary 14 of 'tiai'isforiner G over contact 4-5 of circuit controller D and that the secondary of this transformer is connected directly inparallel with wind ing 7 of track relay R But this relay is intended to be operated only by current supplied thereto from the transformer K located at the opposite end of the section. In order to prevent improper operation of the relay R by current supplied thereto by transformer G 1 reverse the connections of transformer G with respect to the connections of transformer K so that the relative instantaneous polarity of the current supplied to winding 7 of relay R by trans former G is opposite to the relative instantaneous polarity of the current supplied to this winding by transformer K". The ten dency of the current supplied by transformer G therefore is to open relay R rather than close this-relay.

I will next assume that the section to the left of point A is occupied by a train. Sig.- nal S therefore indicates stop so that contact -l-6 of circuit controller D is closed. It, now, a west-bound train enters section A E, relays P and Q? are operated as before, but back contact d3 of control relay P is no longer included in the circuit for primary 1.1 of transformer K so that the alternating current supplied to the rails of section AB in advance of the second train is uninterrupted. I will next assume that an eastbound, train occupies section A-B. The presence of this train in this section causes signals S and S to indicate stop, but signal S indicates proceed. The train in section A'B causes the deenergization of relay R thereby connecting secondary. 13

ing current will not close relay R.

If section is occupied by a second east-bound train, signal will indicate stop so that primary 14, of transformer G will be disconnected from transformer L with the resultthat no alternating current will be supplied to the rails of section AB in advance of the train in that section.

Although I have herein shown and described only one form of railway traffic controlling apparatus embodying my invention, it is understood that various changes and modifications may be made therein within the scope of the appended claims without departing from the spirit and scope of my invention.

Having thus described my invention, what l claim is:

1. Railway trallic controlling apparatus comprising a section of railway track over which tralilc moves in both directions, and means for at times supplying both ends of said section with interrupt-ed alternating current.

2. Railway ill'ill'llf) controlling apparatus comprising a railway track divided into sections over which trathc moves in both direc tions, and means effective when a section is occupiedby a train moying in either direction and controlled by traiiic conditions in aovance of the train for supplying the rails of the section ahead of the train upted alternating current.

Railway traffic controlling apparatus comprising a section of railway track over which traiiic moves in both directions, and means effective when said section is occupied by a train moving in either direction and controlled by trailic conditions beyond said section and ahead of the train for supplying the rails of the sect-ion ahead of such train with interrupted alternating current.

45. Railway tratlic controlling apparatus comprising a section of railway track over which traiiic moves in bothdirections, means for normally supplying uninterrupted alternating current to one end of said section, means effective when such section is occu. pied by a train approaching said one, end of the section and responsive to trathc conditions in advance of such train for supplying interrupted alternating current to the rails ahead of the train, and means effective i with interthe train with interrupted alternating current.

5. Railway trallic controlling apparatus comprising a section of railway track over which ti moves in both directions, two transfer-inc s one located adjacent each end of said section for supplyi'g current to the rails of the section, means for normally supplying uninterru tited alternating current to one of said transformers, means en ective when such sectic l is occupied by a train movi a n one djectilon and responsive to traffic conditions in advance of such train for supplying interrupted alternating current to said one transformer, and means effective when the section occupied by a train moi'ing in the opposite direction for at times supplying the r aining transformer with interrupter alternating current,

6. Railway trallic con "oll'ing apparatus compr-isii g a section of railway track over which tra 7 he moves in both directions, a first transformer having its secondary connected across the rails adjacent one end of said section, a first device controlled trailic conditions for governing trailic leaving said section at said one end, a track relay connected across the rails adjacentthe other end of said section, a second transformer having its secondary connected across the rails adjacent said other end of the section in series with a contact of said relay, a second device controlled by traf ic conditions for controlling tra'llic leaving said section at said other end, means controlled by said first device for supplying the primary of said first transformer with uninterrupted alternating current or with interrupted alternating current and means controlled by said second device for attimcs supplying the primary of said second transformer with interrupted alternating current. i

7. Railway traflic controlling apparatus comprising a section of railway track over which traiiic moves in both directions, a first transformer having its secondary connected acr the rails adjacent the left-hand end of said section, a second transformer, means for connecting the secondary of said second transformer across the rails adjacent the right-hand end of the section, two normally open control relays one located adjacent each end of the section and each arranged to alternately open and close its contacts when- -sai.d section is occupied by a train, a first signal for controlling westoound traliie leaving said section, means controlled by said first signal and by one of said control relays for supplying alternating current to the primary of said first transformer, a second signal for controlling eastbound trafl ic leaving said sect-ion, means controlled by said second signal and by the remainingcontrol relay for supplying alternating current to the primary of said second transformer.

8. Railway tratlic controlling apparatus comprising a section of railway track, a first transformer l'i'aving its secondary connected acre 3 the rails of said section adjacent one enc- .thcreof, means for supplying alternating current to the primary of said first transformer, a tra'cl: relay having one windingconnected with tie rails of said section and a second winding constantly supplied with alternating current, a second transformer, means for connecting the secondary of said second transformer with the rails adjacent the other end of said section, means for times su iiplying interrupted alternating current to the primary of said second transformer, the secondaries of said two transformers being oppositely connected with the rails of said stretch so that said relay may become energized by current from said first transformer but not from said second trzmstormer.

9. Railway traliic controlling apparatus comprising a section of railway track over which trallic moves in both directions, two normally (ls-energized control relays, means for intermittently operating both said control relays when said section is occupied by a train, means controlled by one said control relay for at times supplying interrupted alternating current to the rails adjacent one end of the section, and means controlled by the other control relay for at times supplying interrupted alternating current to the rails adjacent the other end of the section.

10. Railway traffic controlling apparatus comprising a section of railway track over which traffic moves in both directions, two normally de-ener 'ized control relays, means for intermittently operating both said control relays when said section is occupied by a train, means controlled by traffic conditions and including one of said control relays for supplying uninterrupted alternating current or interrupted alternating current to the rails adjacent one end of the section, and means also controlled by tran'ic conditions and including the remaining control relay for at times supplying interrupted alternating current to the rails adjacent the opposite end of the section.

11. Railway traffic controlling apparatus comprising a section of railway track over which trafiic moves'in both directions, a track relay connected across the rails of the section, two normally dis-energized control relays, means for intermittently operating both said control relays when said track relay is de-energized, means controlled by one of said control relays for at times supplying the rails adjacent one end of the section with uninterrupted alternating current or with interrupted alternating current according as such control relay is de-energized or is intermittently operated, means responsive to tratfic conditions for at times removing said control relay from the control of such current, and means controlled by the remaining control relay for at times supplying the rails adjacent the opposite end of said section with interrupted alternating current.

12. Railway traiiic controlling apparatus comprising a section of railway track over which tratiic moves in both directions, a track relay connected with the rails adjacent one end of the section, means for normally supplying uninterrupted alternating current to the rails adjacent the other end of the sec tion, and means controlled by said track relay for at times supplying interrupted alternatin current to the rails adjacent one end or t 1e other of said stretch in accordance with traffic conditions. a

13. Railway traflic controlling apparatus comprising a section of railway track over which traiiic moves in both directions, and means effective when said section is occupied by a train for at times supplying both ends of the section with interrupted alternating current.

14L. Railway traffic controlling apparatus comprising a section of railway track over which traflic moves in both directions, and means effective when said sectlon 1S occupied ends of the section with interrupted alternating current.

16. Railway tratiic controlling apparatus comprising a section of railway track over which traific moves in both directions, means for normally supplying one end of the section with uninterrupted alternating currenti means effective when said section is occu ied by a. train approaching such one end 0' the section and responsive to traffic conditions in advance of the train for periodically interrupting said current, means effective when said section is occupied by a train moving in the opposite direction for supplying interrupted alternating current to the rails ahead of such train, and means responsive to traffic conditions for at times discontinuing the supply of such last-mentioned current.

In testimony whereof I afix my signature.

manner A, WALLACE. 

